If 1.0 mol of N2 and 3.0 mol of H2 in a closed container initially at STP react completely in the reaction shown below, then the final pressure in the flask will be atm at 273 K.

Explanation:

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In this case, since the reaction between nitrogen and hydrogen produces ammonia:

We can compute the volume of the container by using the ideal gas law at STP (1 atm and 273.15 K):

Next, since nitrogen and hydrogen are in a 1:3 mole ratio, we understand all the nitrogen and hydrogen are consumed and only ammonia remains at the end of the reaction in the following amount:

Thus, the final pressure turns out:

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